Ok i had my car off the road for about 2.5 months and i was doing work to it while it was off the road, i had the valve covers and intake off for about 4 weeks but its all running now but under load it has a real loud tinny rattle at the front of the RHS head.
but if it is in park and i slowly raise the RPM i dont get it, I only get it when i blip the throttle or under load (quickly moving off from the lights).

Do you think this is a dud lifter or something else?
It is REAL LOUD and distracting!